I have seen users request longer transition times more than once to be able to make slow changing light transitions without the use of very long playlists or external software.

While increasing transition time in general is a non-starter, this could be done for basic transitions using an FX.

The proposal is this:

• speed slider controls the number of minutes for the transition, 0 could mean 10s which is good for testing.

all the FX does is display the currently selected palette on the segment. this way it can be used as a mask.

the effect stores three states in segment data:

• initial state
• current state
• target state

if the palette (or the selected color if used) changes, the current state becomes the initial state and the new state becomes the target state. states should update at 10Hz but rendering should take place each frame.

using palette blending / color blending this allows for very slow brightness (black to white in overlay for example) or color transitions.
could even use another slider to select a "target preset" that is triggered once the time has run out. that is a hack though as FX should probably not be triggering presets. it would be a simple way to generate "very slow playlists" by chaining such slow transition effects without having to use the scheduler.